Protemos translation management for freelancers https://protemos.com/tms-for-freelance-translators.html is great to accommodate freelancing work. Simple, efficient, easy to use.
Easy to navigate, stable data handling, multiple useful options for freelancers and small businesses dealing with international clients (currencies, etc.), basic project management tool, clear invoice list with what's coming at term what is overdue, clear project list, easy to manage.